<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>09_绝对定位</title>
    <style>
        .fu {
            background-color: #ff0;
            position: relative; /* 子绝父相 */
            width: 500px;
        }
        .fu>div {
            width: 100px;
            height: 100px;
        }
        .z1 { background-color: #f00; }
        .z2{
            background-color: #0f0;
            /* 绝对定位:会脱离文档流，释放布局空间
             移动参照物:离自己最近的，有非静态定位属性的上层元素，终点是html */
            position: absolute;
            top: 0;
            right: 0;
        }
        .z3 { background-color: #00f; }
    </style>
</head>
<body>
<div class="fu">
    <div class="z1"></div>
    <div class="z2"></div>
    <div class="z3"></div>
</div>
</body>
</html>